Lawn-mower sharpener



April 2, 1929. l 1 H .HUFFMAN 1,707,396

LAWN MOWER SHARPENER Filed June 2l, 1927 5 SheetsfSheet 2 "g1/vomito@ .fom @Hummm April 2, 1929 J. H. HUFFMAN 1,707,396

LAWN MowER SHARPENER Filed June 21, 1927 5 sheets-sheet 5 5l rE'. 5 25a' a.. ii a 49 95@ i6 l 1^? R fla* i 19a 46.4@

l@ 23 /l I r`- Y: f//Q /f "fa" L" i4!" 54. l Q 3Q- gymntoz Patented Api'. 2, 1929.

unirsiV STATES- ieii'iiiiifr oFFiCE.

Y JOHNH; HU'EFMAN, or covINGTon TENNESSEE, AssIGNoE 0E ONE-HALF 'ro CHARLES-1.v sIMoNroN, or coviNG'roN, TENNESSEE.

* LAwN-ivrowEn sHAnrENER.

Appiica'non iiiepd June si,

This invention aims to provide a novel' ineans whereby the blades of thel cutter head lof a lawn mower may be sharpened, thecutter head and the blades being turned, and-the sharpening element remaining stationary,

saving'in so` far as itis adjusted lengthwisel of movable parts, subject to deterioration,`

being reduced to a minimum, durability and simplicity oit adJustment being promoted.

'further obiect of the invention isto provide a lawn mower-sharpener which will be inexpensive to manufacture, thearticle, ,inotwithstanding itslow price, loperating in so satisfactory a way that it will replace eX- Y pensive lown mowerSharpeners, and'do away with sharpening by hand file, and other timeconsuniiiigmethods of a similar kind. y

It is within the province of the 'disclosure to improve generally and to enhance the utility of devices of that type to which the invention appertains,

l/Vith the above and other objectsin view which will appear as the description proceeds, 4 the invention resides.A in the combination and havingeiid flanges 17 intoV which are threaded arrangement of parts and `in the 'details of construction hereinafter described and claimed, it being understood that changes vin the precise embodiment of ,the` invention herein disclosed, may be made within the scope of what is claiined,without departing from the spirit of the invention. f In the drawings f p Figure 1 shows in top plan, adevice constructed in accordance withy the invention, assembled with a lawn mower;

Figure 2 is an elevationgof they sti'ucture shown in Figure 1; f l Figiire 3 is an enlarged vertical cross section showing the mower, its support, and the sharpening mechanism in place;

Figure t yis a sectional view disclosing the holderfand the. sharpening element g.

Figure 5 is a view similar to gure 3, but showing a modilication; i 'l Figure 6 is an elevation showing a modifiedv attaching bracket Figure 7 is a sectional view illustrating the f handle.

Y The lawn rinowei which is tobe sharpened,

may be held in various ways. ln thedrawf i927. serial No. 200,418.

ings, butnot ofv necessity, there is provideda trestie 1 including a platform 2`carrying sills havingiseats 4, they sills 3 being connected .by a cross piece 5.- An anchor` v6 is vertically adjustable in the platform 2, and maybe a vhook bolt overhanging the seatsl.

' ln the drawings, there is shown. a lawnV i mower, the frame of wl'iichembodies a cross rod 7. yThe rotatable ground Vwheels are lshown at 8, and sometimes have spokes 9.

The cutter head 10 is driven from the ground f wheels 8 by a gearing, not shown in the drawings, but understood thoroughly by anyl 'one' The blades 11fof thevk skilledin thisart. y cutter head eo'operate' with the fixed shear bary 12. The roller of the -mower is shown at 1t In preparingthe mower for sharpening, n

the lix'ed shear bar 12 is yshifted a little way from the blades 1,1.of thevcutter headlO, -the roller 14 is mounted in the'seats 4, and

the anchor 6 is engaged with the roller 14; to hold the lawn mower on the trestle 1, in the position shown in the drawings. l

The numeral 15 designatesk a 'grinding block, .of carborundum or other suitable inaterial, wherebythe blades 11 are sharpened. Theblockv15 may betas. longas desired and isretained iny a holder including la plate 1G set screws 18, adapted -to engage the ends of thegrinding block V15,.the set screws being heldin place by lock nuts 19 which bear upon the end ianges 17. Straps 20exten'd trans,-

- veisely of the platelG atthe ends ofthe plate,

V2O. Thebrackets 22 are yprolonged downwardly and forwardly.beneaththe grinding block. 15 and'v its holder, as shown in Figure 3 of the'di'awings, the brackets terminating attheir lower 'ends inv U,shaped aws 23. In the outer `wall of each jaw 2 3, a clamp 4screw 24 is threaded. The shear' bar 12 of the lawn nioweris `received in the jaw 23, and the shear barmay be clamped between the kinner end of the screw 24 and the adjacent wall'of the fixed jawf23, as shown best in Figure 3=iof the drawings.` p A An artnet, considerable length extends up from the operation of the structure shown in Figure 3, to any great extent, it being understood that when the ground wheel 8a is rotated, the usual lawn mower vgearing will The general operation of the device shown 1n Figure 5 of the drawings does not differ cause the cutter head a to turn, the blades 11EL of the cutter headbeing broughtinto engagement with the grinding,` block 15ay in a way which will be understood without diliiculty when Figure 5 is noted.

The use of the carborundum its equivalent, together with the novel means employed Afor mounting' and operating the block, produce uniformity of result in thev depending supporting bracketcarried by the grinding operation, coupled with' a saving of time and labor. f

The article is of small dimensions, and light in weight, and a workman catering to a custom trade, may carry the grinder fromA `place to place and do a highy gradeof work on the job. The sharpening of the lawn mower may be brought about without pulling the lawn mower apart, or changing its adj ustments, aside from shifting thev shear bar slightly with respect to the blades.

Some operators may prefer, ifi-the machine is to be power-driven, to lapply the belt' (not shown)l directly on thel face of one of the drive wheels or ground wheels 8, in which event the pulley 36 would bedispensed with. A The hook-shaped Ajaw l--see Figure 7 of tact with the grinding blockv l5 during the sharpening process.

What is claimed is 1. In adevice for sharpening lawn mowers, a holder for a grinding element, a depending supporting bracket carried by the holder and provided withmeans for engaging the shear bar of a lawn mower, an upsta-nding arm carried by the holder,a standard provided with means for engaging a stationary party of the l frame of a lawn mower, a link, and combined clamping and pivot elements j oining, the link to the arm and to the standard.

- 2. Ina ydevicev for sharpening a lawn,y

mower, a holder for a grinding element, a

holder and provided with means for engagingv the shear bar of' a lawn mower, an upstanding arm connected to the holder,`a han-V dle forming a reenforcing connection between the holder and the intermediate portion of the arm, a standard provided at one end with means for engaging a stationary part of the frame of a lawn mower, means for connecting thek standardto the arm adjustably, and means for supporting a lawn mower in inverted position, whereby the last specilied connecting means will be rendered readilyv accessible at the top of the mower, and where` by the handle will be rendered readily accessibleat one side of the mower to permit an adjustment ofthe holder lengthwiseof the cutting blades of the mower, with the shear bar of themower and said stationary part as supports. y c

In testimony that I claim the foregoing ture. Y

OHN H'. I-IUF-FMAN.v

"5 as my own, I have hereto aflixedmy'signa- 'i 

